300-415 Question 158
Single answerYou are configuring an SD-WAN environment where EIGRP is being used as the underlay routing protocol. The branch routers are connected to the WAN edge devices. You observe that EIGRP routes from the branch routers are not being advertised into the SD-WAN overlay. What could be the cause of this issue?
- A
The EIGRP process is not configured on the WAN edge device.
- B
Route redistribution from EIGRP to OMP is not configured on the WAN edge device.
- C
The EIGRP AS number on the WAN edge device does not match the branch routers.
- D
OMP is not enabled on the branch routers.
Show answer and explanation
Correct answer: B
Explanation
In Cisco SD-WAN, EIGRP is often used as the underlay routing protocol at branch sites. To propagate EIGRP-learned routes into the SD-WAN overlay, route redistribution from EIGRP to OMP must be configured on the WAN edge devices. Without this redistribution, the SD-WAN overlay will not have visibility of the underlay routes, leading to traffic forwarding issues.
- A. Incorrect.
While EIGRP must be configured on the WAN edge device, this alone does not ensure route propagation into the SD-WAN overlay. Route redistribution is essential.
- B. Correct.
Route redistribution from EIGRP to OMP is required to advertise EIGRP-learned routes from the underlay into the SD-WAN overlay. Without this configuration, the routes will not propagate.
- C. Incorrect.
A mismatch in the EIGRP AS number would prevent EIGRP neighbor adjacency between the branch routers and the WAN edge device, but the question indicates that EIGRP routes are already present on the WAN edge.
- D. Incorrect.
OMP is an SD-WAN protocol that operates on the overlay, not the branch routers. Branch routers do not need to run OMP directly; they rely on the WAN edge device for route exchange.